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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">convert::TryInto</span>, <span class="ident">ops::Add</span>, <span class="ident">time::Duration</span>};
<span class="kw">use</span> <span class="ident">chrono::SubsecRound</span> <span class="kw">as</span> <span class="kw">_</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::Error</span> <span class="kw">as</span> <span class="ident">LimitationError</span>;
<span class="doccomment">/// A report for a given key containing the limit status.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Status</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">limit</span>: <span class="ident">usize</span>,
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">remaining</span>: <span class="ident">usize</span>,
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">reset_epoch_utc</span>: <span class="ident">usize</span>,
}
<span class="kw">impl</span> <span class="ident">Status</span> {
<span class="doccomment">/// Constructs status limit status from parts.</span>
<span class="attribute">#[<span class="ident">must_use</span>]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">count</span>: <span class="ident">usize</span>, <span class="ident">limit</span>: <span class="ident">usize</span>, <span class="ident">reset_epoch_utc</span>: <span class="ident">usize</span>) -> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">remaining</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">count</span> <span class="op">></span><span class="op">=</span> <span class="ident">limit</span> { <span class="number">0</span> } <span class="kw">else</span> { <span class="ident">limit</span> <span class="op">-</span> <span class="ident">count</span> };
<span class="ident">Status</span> {
<span class="ident">limit</span>,
<span class="ident">remaining</span>,
<span class="ident">reset_epoch_utc</span>,
}
}
<span class="doccomment">/// Returns the maximum number of requests allowed in the current period.</span>
<span class="attribute">#[<span class="ident">must_use</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">limit</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">limit</span>
}
<span class="doccomment">/// Returns how many requests are left in the current period.</span>
<span class="attribute">#[<span class="ident">must_use</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remaining</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">remaining</span>
}
<span class="doccomment">/// Returns a UNIX timestamp in UTC approximately when the next period will begin.</span>
<span class="attribute">#[<span class="ident">must_use</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reset_epoch_utc</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">reset_epoch_utc</span>
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">epoch_utc_plus</span>(<span class="ident">duration</span>: <span class="ident">Duration</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">LimitationError</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">chrono::Duration::from_std</span>(<span class="ident">duration</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">value</span>) => <span class="prelude-val">Ok</span>(<span class="ident">chrono::Utc::now</span>()
.<span class="ident">add</span>(<span class="ident">value</span>)
.<span class="ident">round_subsecs</span>(<span class="number">0</span>)
.<span class="ident">timestamp</span>()
.<span class="ident">try_into</span>()
.<span class="ident">unwrap_or</span>(<span class="number">0</span>)),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="prelude-val">Err</span>(<span class="ident">LimitationError::Other</span>(
<span class="string">"Source duration value is out of range for the target type"</span>.<span class="ident">to_string</span>(),
)),
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_create_status</span>() {
<span class="kw">let</span> <span class="ident">status</span> <span class="op">=</span> <span class="ident">Status</span> {
<span class="ident">limit</span>: <span class="number">100</span>,
<span class="ident">remaining</span>: <span class="number">0</span>,
<span class="ident">reset_epoch_utc</span>: <span class="number">1000</span>,
};
<span class="macro">assert_eq!</span>(<span class="ident">status</span>.<span class="ident">limit</span>(), <span class="number">100</span>);
<span class="macro">assert_eq!</span>(<span class="ident">status</span>.<span class="ident">remaining</span>(), <span class="number">0</span>);
<span class="macro">assert_eq!</span>(<span class="ident">status</span>.<span class="ident">reset_epoch_utc</span>(), <span class="number">1000</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_build_status</span>() {
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="number">200</span>;
<span class="kw">let</span> <span class="ident">limit</span> <span class="op">=</span> <span class="number">100</span>;
<span class="kw">let</span> <span class="ident">status</span> <span class="op">=</span> <span class="ident">Status::new</span>(<span class="ident">count</span>, <span class="ident">limit</span>, <span class="number">2000</span>);
<span class="macro">assert_eq!</span>(<span class="ident">status</span>.<span class="ident">limit</span>(), <span class="ident">limit</span>);
<span class="macro">assert_eq!</span>(<span class="ident">status</span>.<span class="ident">remaining</span>(), <span class="number">0</span>);
<span class="macro">assert_eq!</span>(<span class="ident">status</span>.<span class="ident">reset_epoch_utc</span>(), <span class="number">2000</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_build_status_limit</span>() {
<span class="kw">let</span> <span class="ident">limit</span> <span class="op">=</span> <span class="number">100</span>;
<span class="kw">let</span> <span class="ident">status</span> <span class="op">=</span> <span class="ident">Status::new</span>(<span class="number">0</span>, <span class="ident">limit</span>, <span class="number">2000</span>);
<span class="macro">assert_eq!</span>(<span class="ident">status</span>.<span class="ident">limit</span>(), <span class="ident">limit</span>);
<span class="macro">assert_eq!</span>(<span class="ident">status</span>.<span class="ident">remaining</span>(), <span class="ident">limit</span>);
<span class="macro">assert_eq!</span>(<span class="ident">status</span>.<span class="ident">reset_epoch_utc</span>(), <span class="number">2000</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_epoch_utc_plus_zero</span>() {
<span class="kw">let</span> <span class="ident">duration</span> <span class="op">=</span> <span class="ident">Duration::from_secs</span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">seconds</span> <span class="op">=</span> <span class="ident">Status::epoch_utc_plus</span>(<span class="ident">duration</span>).<span class="ident">unwrap</span>();
<span class="macro">assert!</span>(<span class="ident">seconds</span> <span class="kw">as</span> <span class="ident">u64</span> <span class="op">></span><span class="op">=</span> <span class="ident">duration</span>.<span class="ident">as_secs</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_epoch_utc_plus</span>() {
<span class="kw">let</span> <span class="ident">duration</span> <span class="op">=</span> <span class="ident">Duration::from_secs</span>(<span class="number">10</span>);
<span class="kw">let</span> <span class="ident">seconds</span> <span class="op">=</span> <span class="ident">Status::epoch_utc_plus</span>(<span class="ident">duration</span>).<span class="ident">unwrap</span>();
<span class="macro">assert!</span>(<span class="ident">seconds</span> <span class="kw">as</span> <span class="ident">u64</span> <span class="op">></span><span class="op">=</span> <span class="ident">duration</span>.<span class="ident">as_secs</span>() <span class="op">+</span> <span class="number">10</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">should_panic</span> <span class="op">=</span> <span class="string">"Source duration value is out of range for the target type"</span>]</span>
<span class="kw">fn</span> <span class="ident">test_epoch_utc_plus_overflow</span>() {
<span class="kw">let</span> <span class="ident">duration</span> <span class="op">=</span> <span class="ident">Duration::from_secs</span>(<span class="number">10000000000000000000</span>);
<span class="ident">Status::epoch_utc_plus</span>(<span class="ident">duration</span>).<span class="ident">unwrap</span>();
}
}
</code></pre></div>
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